we are talking large storage battery banks here. some batteries already do around 10 to 20 years. the problem is not the requirement to sell more batteries,but rather the limitations of lead acid battery design. i feel that it is already as far as is practical to go in terms of cost weight and performance. you could have lead acid batteries that last 50 years but the sheer size would limit those to telecom back up and grid peaking. as that report says the practical limits are already near what is possible and economical. sure for simple tasks like car electrics a long life battery would be nice but is impractical. they are already as cheap as they can get considering the environment they have to perform in. consider them a consumable same as oil filters belts ect. say they cost 100 dollars ,and last 2 years. that's only one dollar per day. not bad when you think how hard it has to work.